<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      #div {
        width: 40px;
        height: 40px;
        border: 1px solid red;
        color: red;
      }
    </style>
  </head>
  <body>
    <!-- <div id="div">
      <a href="" target=""></a>
    </div>
    <div>
      <button class="btn">点击</button>
    </div> -->
    <div>
      <div></div>
      <div></div>
      <div></div>
    </div>
    <script src="../js/lodash.min.js"></script>
    <script src="../js/js-demo4.js"></script>
  </body>
</html>
